B is correct. The principal architectural advantage of a Distributed Transit Gateway (DTGW) is that it provides external VPC connectivity directly from the ESX hosts to the physical network , without requiring NSX Edge VMs or a Tier-0 gateway. In the distributed connectivity model, the Transit Gateway maps directly to an external VLAN shared by the participating ESX hosts . This reduces infrastructure footprint, removes an additional forwarding hop, and accelerates VPC onboarding. ( VMware Blogs )

For workloads requiring external connectivity, addresses can be allocated from the VPC ' s external IP block associated with that VLAN. The distributed gateway then forwards traffic between the VPC and physical network without forcing traffic through centralized Edge appliances. VCF 9.x specifically positions DTGW as the simpler model when customers need basic connectivity and do not require the complete centralized network-services stack. ( VMware Blogs )

A is incorrect because DTGW intentionally eliminates the NSX Edge cluster and therefore does not depend on static routing policies configured there. C is incorrect because centralized stateful services—particularly VPN—are characteristic of the centralized Transit Gateway model; VPN remains exclusive to centralized connectivity. D is incorrect because DTGW does not instantiate distributed Tier-0 service routers in an Active/Active Edge topology. Its northbound connectivity is directly to the physical VLAN.

Study Guide References/Topics: VCF VPC Networking; Distributed Transit Gateway; Distributed External Connectivity; Edgeless Networking; External VLAN Connectivity; VPC External IP Blocks; Centralized vs. Distributed Transit Gateway Design.